2640231 has 12 divisors (see below), whose sum is σ = 4160520. Its totient is φ = 1600080.

The previous prime is 2640227. The next prime is 2640251. The reversal of 2640231 is 1320462.

It is a happy number.

2640231 is a `hidden beast` number, since 2 + 640 + 23 + 1 = 666.

It is not a de Polignac number, because 2640231 - 2² = 2640227 is a prime.

It is a super-2 number, since 2×2640231² = 13941639466722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13236 + ... + 13433.

It is an arithmetic number, because the mean of its divisors is an integer number (346710).

2^2640231 is an apocalyptic number.

2640231 is a deficient number, since it is larger than the sum of its proper divisors (1520289).

2640231 is a wasteful number, since it uses less digits than its factorization.

2640231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26686 (or 26683 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2640231 is about 1624.8787647083. The cubic root of 2640231 is about 138.2124955629.

Adding to 2640231 its reverse (1320462), we get a palindrome (3960693).

The spelling of 2640231 in words is "two million, six hundred forty thousand, two hundred thirty-one".